Mechanical Grinding

Types of Grinding Machines: Description of various grinding machines such as surface grinders, cylindrical grinders, and tool and cutter grinders.

Grinding machines are essential tools in the field of mechanical engineering used for finishing metal parts and bringing them to precise dimensions and surface qualities. Grinding processes involve an abrasive wheel that removes material from a workpiece by means of shear deformation. Various types of grinding machines cater to different applications, including surface grinders, cylindrical grinders, and tool and cutter grinders.


Surface Grinders:
A surface grinder consists of an abrasive wheel, a chuck (either electromagnetic or vacuum), and a reciprocating or rotary table. The primary function of this machine is to produce a smooth finish on flat surfaces. It operates by mounting the workpiece on the table which then moves back and forth under the rotating abrasive wheel. The depth of cut is typically very small, measured in thousandths of an inch. Surface grinders are utilized in creating parts that require extremely flat and smooth surfaces. They are commonly used in automotive, aerospace, tool and die, and manufacturing industries.


Cylindrical Grinders:
Cylindrical grinding machines are mainly used for shaping the outer surface of cylindrical objects. These machines consist of a base with an adjustable table that can either rotate at one end or slide along its length; a headstock that holds one end of the workpiece; a tailstock which supports the other end; and a grinding wheel positioned according to the desired angle or radius. This setup allows high precision in manufacturing tubes, rods, and other components where roundness, concentricity, and surface finish critical parameters.


Tool and Cutter Grinders:
Tool and cutter grinding machines are sophisticated pieces of equipment designed primarily for sharpening milling cutters, reamers, taps, and other cutting tools as well as forming new cutting edges on various tools. These machines are versatile in nature equipped with attachments such as additional heads for complex angles or shapes. Tool grinders often feature multiple axes which allow fine control over the shape of cuts thus enabling custom profiles on cutting edges tailored according to specific engineering requirements.


Each type serves a unique purpose yet shares common functionalities essential for precision machining operations necessary across various sectors within mechanical engineering fields such as automotive manufacturing or aerospace maintenance among others ensuring they meet strict dimensional standards while achieving desirable surface properties.

Types of Grinding Machines: Description of various grinding machines such as surface grinders, cylindrical grinders, and tool and cutter grinders.

Grinding Wheels: Materials used in grinding wheels, types, and selection criteria.

Grinding wheels are an indispensable tool in the field of mechanical grinding, used extensively in metal fabrication and woodworking, as well as for the production and refining of many other materials. The effectiveness of a grinding wheel comes from its ability to remove material from a workpiece while leaving behind a smooth finish. This is achieved through the careful selection of materials used in the wheel, its type, and the specific criteria applied during selection.


Materials Used in Grinding Wheels


The primary material used in the manufacturing of grinding wheels is abrasive grains. These grains do the actual work of cutting into the workpiece. The most commonly used abrasives include Aluminum Oxide, Silicon Carbide, Cubic Boron Nitride (CBN), and Diamond. Aluminum Oxide is versatile and can be used with many materials including steel. Silicon Carbide is preferable for working with non-ferrous metals, ceramics, and glass. CBN and diamond abrasives are suitable for high precision and hard material applications.


In addition to abrasive grains, a bonding material holds these grains together and gives shape to the wheel. These bonds could be made from vitrified ceramic bonds, resin bonds, rubber bonds, or even metal bonds depending on the intended use of the wheel.


Types of Grinding Wheels


Grinding wheels come in various types based on their intended use:



  1. Straight Wheels: The most common type; ideal for surface and cylindrical grinding.

  2. Cylinder or Wheel Ring: Used to produce flat surfaces generally.

  3. Tapered Wheel: It tapers outward towards one side; it is useful for gear teeth grinding among other uses.

  4. Diamond Wheels: Incorporates diamonds into the bond matrix; they are essential when dealing with ceramic materials.


Each type caters to different operations required within mechanical grinding tasks – whether it's shaping raw metal pieces or putting finishing touches on precision components.


Selection Criteria for Grinding Wheels


Choosing an appropriate grinding wheel involves considering several factors:



  • Material Hardness: Harder materials require harder abrasives such as diamond or CBN.

  • Grain Size: Coarser grains are good for rapid material removal whereas finer grains are best for achieving a fine finish.

  • Wheel Grade: This indicates strength of bond holding abrasive grains; soft grades release grains quickly which is suitable for aggressive cutting action.

  • Bond Type: Should be chosen based on operation speed - vitrified bonds handle high speeds better than resin bonds.

  • Workpiece Shape:
    Specific shapes may require specialized wheels like tapered wheels or cup wheels to fit contours properly without causing damage.


In conclusion, understanding these factors helps ensure that not only does your selection lead to efficient material removal but also extends the life cycle of both your tools and machines involved in processes like deburring, polishing, sharpening or simply reshaping parts needed across various industries such as automotive manufacturing or construction hardware production. Select wisely based on your specific needs using this knowledge about materials used in making these wheels along with their types available today's market following appropriate selection criteria!

Parameters Influencing Grinding: Including speed, feed rate, depth of cut, and coolant application.

In the realm of mechanical engineering, grinding stands out as a critical finishing process that enhances the surface quality and dimensional accuracy of metal parts. The effectiveness of this process is heavily influenced by several parameters, each playing a pivotal role in determining the outcome's efficiency and quality. Among these parameters, the most significant are speed, feed rate, depth of cut, and coolant application. Understanding how these factors interact can significantly optimize grinding operations.


Firstly, the speed of the grinding wheel is a fundamental parameter that affects both the efficiency and quality of grinding. High speeds can lead to greater rates of material removal due to increased kinetic energy at the point of contact between the wheel and the workpiece. However, exceedingly high speeds may also generate excessive heat leading to thermal damage on the workpiece surface such as burns and microcracks. Thus, selecting an appropriate speed is crucial; it must be sufficient to ensure efficient material removal but not so high as to cause surface degradation or shortened tool life.


Feed rate – the speed at which the workpiece is fed into the grinding wheel – also plays a critical role in grinding operations. A higher feed rate reduces machining time but may compromise finish quality and increase wear on the grinding wheel. Conversely, a slower feed rate might result in better surface finishes and extended wheel life but can decrease overall productivity. Finding an optimal balance based on material properties and desired finish is essential for effective grinding.


The depth of cut refers to how deep the abrasive grains penetrate into the surface of the material being machined. This parameter directly impacts material removal rate (MRR). A deeper cut facilitates higher MRR which can improve productivity but might increase mechanical stresses exerted on both tool and workpiece leading to potential distortions or damages. Therefore, similar to other parameters, moderation is key when determining depth of cut depending on specific operation requirements.


Lastly, coolant application cannot be overlooked when discussing parameters influencing grinding processes. Coolants primarily serve two purposes: cooling and lubrication. By reducing heat generation at the interface between wheel and part, coolants help in avoiding thermal damages like burns that affect part integrity and aesthetics. Moreover, they aid in flushing away debris or swarf from cutting areas thus reducing frictional forces during interactions between tool surfaces and workpieces; this not only protects against premature wear but also helps achieve finer finishes.


In conclusion, successful mechanical grinding requires careful consideration and optimization of various operational parameters including speed, feed rate, depth of cut, and coolant application. Each factor interplays intricately with others affecting outcomes in terms of productivity rates as well as final product quality attributes such as dimensional accuracy or surface roughness levels achieved after processing activities are completed.

Parameters Influencing Grinding: Including speed, feed rate, depth of cut, and coolant application.
Grinding Process Optimization: Techniques for improving efficiency and accuracy in grinding operations.

Grinding Process Optimization: Techniques for improving efficiency and accuracy in grinding operations.

Grinding process optimization is a critical aspect of the manufacturing sector where precision and efficiency play pivotal roles. Mechanical grinding, one of the most common machining processes, involves the removal of material from a workpiece by abrasion with a rotating wheel. The ultimate goal in optimizing this process is to enhance productivity, ensure surface finish quality, minimize operational costs, and extend the life span of the grinding tools.


One fundamental technique for optimizing the grinding process is selecting the appropriate type of grinding wheel. The choice depends on the material being processed, the required surface finish, and other specific needs of the task. Abrasive materials such as aluminum oxide or silicon carbide are selected based on their hardness and wear resistance which directly impact both efficiency and accuracy.


Another crucial factor in grinding optimization is wheel dressing. Dressing refers to conditioning the cutting surface of a wheel by removing clogs and restoring its sharpness. Proper dressing not only improves the quality of surface finish but also increases precision by ensuring that the geometry and dimensionality are consistent throughout the operation.


Process parameters such as speed, feed rate, and depth of cut must also be carefully optimized. High speeds might increase production rates but can cause excessive heat build-up leading to thermal damage on both tool and workpiece surfaces. Conversely, lower speeds may result in better surface finishes but reduced productivity. An optimal balance must be achieved based on specific production requirements using empirical studies or advanced simulation models.


Incorporating advanced technologies has proven immensely beneficial in enhancing grinding processes. Computer Numerical Control (CNC) systems allow for precise control over speed, movement, and other variables contributing significantly to both accuracy and repeatability. Additionally, real-time monitoring systems equipped with sensors provide immediate feedback about forces, temperature, vibration levels etc., enabling adaptive adjustments to be made during operation to avoid defects.


Automation in grinding through robotics is another technological leap forward. Robots bring consistency to repetitive tasks while reducing human error and increasing safety by taking over hazardous operations such as high-speed metal removal.


Lastly, maintaining an environmentally sustainable approach has become indispensable in modern manufacturing paradigms including grinding operations. Techniques like minimum quantity lubrication (MQL) help reduce coolant use significantly thus decreasing environmental impact while still providing necessary lubrication to avoid overheating.


In conclusion, optimizing mechanical grinding processes involves a combination of choosing right tools and materials; understanding and controlling operational parameters; leveraging advanced technology for precision control; automation for consistency; along with maintaining an eco-friendly approach towards operations. As industries strive towards higher efficiency standards coupled with stringent quality demands; continued research into innovative techniques will undoubtedly drive future advancements in mechanical grinding methodologies.

Stump Grinding Techniques Powder Springs, GA

Safety Measures in Grinding Operations: Overview of safety equipment and practices to ensure operator safety.

Mechanical grinding operations are integral in various industries, such as manufacturing and metalworking. These processes involve the use of powerful machines to shape or finish metals and other materials by abrasive action, which can pose significant safety risks to operators. Consequently, implementing robust safety measures and using appropriate safety equipment are essential to ensure operator protection.


Understanding Grinding Hazards


The primary hazards associated with mechanical grinding include flying particles, tool misuse, airborne dust, noise exposure, and potential contact with moving parts. Flying particles can cause eye injuries or even blindness if proper eye protection is not used. Prolonged exposure to high decibel levels can lead to hearing loss. Moreover, the dust produced during grinding operations could be harmful if inhaled and might lead to respiratory issues or other health problems.


Essential Safety Equipment


To mitigate these risks, several pieces of personal protective equipment (PPE) must be used:



  1. Eye Protection: Safety goggles or face shields should be worn at all times to protect against flying particles.

  2. Hearing Protection: Earplugs or earmuffs help prevent noise-induced hearing loss.

  3. Respiratory Protection: Masks or respirators are crucial when working with materials that generate harmful dust.

  4. Protective Clothing: Durable work clothes covering most of the body can shield against sparks and minor abrasions.


Safe Operating Practices


Beyond wearing PPE, maintaining safe operating practices is vital for reducing risks:



  • Training: Operators should receive thorough training on the correct use of grinding machines and understand the specific hazards related to their particular machine type.

  • Inspections: Regular inspections of the grinding equipment before use can catch potential issues that may compromise safety.

  • Maintenance: Routine maintenance ensures that machines operate smoothly and remain safe for use; this includes checking grinding wheels for cracks or defects.

  • Work Area Organization: Keeping the work area clean and free from obstructions allows for safe movement around machinery. Proper lighting is also necessary to ensure visibility during operation.

  • Emergency Procedures: Clear knowledge of emergency stops on machines and first aid procedures enhances response actions during an incident.


Implementing these safety measures significantly minimizes the risk associated with mechanical grinding operations. Companies must prioritize worker safety by enforcing strict adherence to these practices combined with regular training updates as new technologies and procedures emerge.


In conclusion, while mechanical grinding is a process fraught with potential hazards, a comprehensive approach involving appropriate protective gear and stringent operational protocols effectively safeguards workers' health and well-being. This proactive stance on workplace safety fosters a safer environment conducive to productivity and longevity in any industry relying on mechanical grinding techniques.

Environmental Impact of Grinding Processes: Discussion on waste management and sustainable practices in mechanical grinding.
Environmental Impact of Grinding Processes: Discussion on waste management and sustainable practices in mechanical grinding.

Environmental Impact of Grinding Processes: Emphasizing Waste Management and Sustainable Practices in Mechanical Grinding


Mechanical grinding, a pivotal operation in the manufacturing sector, is utilized extensively for finishing surfaces and shaping materials. This process, crucial for producing smooth finishes on metals and various composites, involves removing excess material through abrasion techniques. However, the environmental implications of mechanical grinding are significant and demand careful consideration. The focus on waste management and sustainable practices within this context not only addresses ecological concerns but also enhances efficiency and compliance with regulatory standards.


The environmental impact of mechanical grinding primarily manifests through the generation of substantial quantities of waste, including metal swarf (chips or filings), lubricants, and abrasives. These wastes pose considerable challenges in terms of disposal and recycling. Ineffective waste management can lead to severe pollution issues; metal particles can contaminate water bodies affecting aquatic life, while used lubricants carry harmful chemicals that can seep into the soil and groundwater.


Addressing these issues requires a robust approach centered around optimizing processes and integrating sustainable practices. One effective strategy is the implementation of closed-loop systems for material use. By recapturing and recycling metal filings and other remnants from the grinding process, manufacturers can significantly reduce waste output. This not only diminishes environmental contamination but also lowers material costs through reuse.


Moreover, advancements in abrasive technology contribute substantially to sustainability in mechanical grinding. The development of longer-lasting abrasives reduces the frequency of replacements needed, thereby minimizing waste associated with worn-out materials. Additionally, using biodegradable lubricants can alleviate environmental hazards linked to chemical-based products traditionally used in grinding processes.


Another vital aspect is adopting cleaner production techniques such as dry grinding or minimal quantity lubrication (MQL). These methods notably decrease the reliance on coolants and lubricants that contribute to environmental degradation when disposed improperly. Dry grinding eliminates the use of liquid coolants altogether by relying on advanced abrasives engineered to withstand high temperatures generated during metalworking operations without additional fluids.


Furthermore, energy consumption is an often overlooked component contributing to the environmental footprint of mechanical grinding operations. Optimizing machine efficiency through regular maintenance practices like ensuring sharpness of abrasives ensures that less power is required for each operation – conserving energy and reducing operational costs alongside carbon emissions.


In addition to technological improvements, fostering a culture of sustainability within workshops through training programs that educate workers about best practices in waste management can amplify positive outcomes significantly. Such initiatives empower employees to contribute actively towards achieving eco-friendly goals.


In conclusion, while mechanical grinding is indispensable for modern manufacturing processes due its effectiveness in material handling and processing capabilities; it carries inherent environmental impacts which need systematic addressing through innovative waste management strategies coupled with sustainable practices ingrained throughout operational protocols. By embracing these approaches comprehensively across industrial platforms where mechanical grinding is employed – businesses not only ensure compliance with evolving environmental regulations but also move towards creating greener manufacturing landscapes conducive for future generations.

The International Society of Arboriculture, commonly known as ISA, is an international non-profit organization headquartered in Atlanta, Georgia,[1] United States. The ISA serves the tree care industry as a paid membership association and a credentialing organization that promotes the professional practice of arboriculture.[2] ISA focuses on providing research, technology, and education opportunities for tree care professionals to develop their arboricultural expertise. ISA also works to educate the general public about the benefits of trees and the need for proper tree care.[3][4]

Worldwide, ISA has 22,000 members and 31,000 ISA-certified tree care professionals with 59 chapters, associate organizations, and professional affiliates throughout North America, Asia, Oceania, Europe, and South America.[5]

Credentials

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ISA offers the following credentials:

  • ISA Certified Arborist
  • ISA Certified Arborist Utility Specialist (for those maintaining vegetation around electric utility wires)
  • ISA Certified Arborist Municipal Specialist (for those with additional experience managing public urban trees)
  • ISA Certified Tree Climber
  • ISA Certified Tree Worker Aerial Lift Specialist
  • ISA Board Certified Master Arborist
  • ISA Tree Risk Assessment Qualification

ISA Certified Arborist

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James Kinder, an ISA Certified Municipal Arborist, examining a Japanese hemlock at Hoyt Arboretum
A Hinoki cypress receiving some corrective pruning by a certified arborist in Oregon

The Certified Arborist credential identifies professional arborists who have a minimum of three years' full-time experience working in the professional tree care industry and who have passed an examination covering facets of arboriculture.[6][7] The Western Chapter of the ISA started the certification program in the 1980s,[citation needed] with the ISA initiating it in 1992.[8]

ISA Board Certified Master Arborist

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The Board Certified Master Arborist (BCMA) or simply Master Arborist credential identifies professional arborists who have attained the highest level of arboriculture offered by the ISA and one of the two top levels in the field. There are several paths to the Board Certified Master Arborist, but typically on average each has been an ISA Certified Arborist a minimum of three to five years before qualifying for the exam (this can vary depending upon other education and experience). The certification began as a result of the need to distinguish the top few arborists and allow others to identify those with superior credentials.

The Master Arborist examination is a far more extensive exam than the Certified Arborist Exam, and covers a broad scope of both aboriculture management, science and work practices. The exam includes the following areas:

  • Science: Abiotic Influences; Biology; Biotic Influences; Diagnostic Process; Diagnostic Tools; Plant Identification and Selection; Soil Sciences
  • Practice: Climbing, Rigging, and Removal; Installation; IPM; Water Management; Pruning; Soil Treatments; Soil & protection
  • Management: Business Relations; Inventory and Management Plans; Plant Appraisal; Risk Assessment; Safety; Tree Preservation

Another credential that is on a par with the Master Arborist is that of the American Society of Consulting Arborists, the Registered Consulting Arborist.[9] There are perhaps six hundred individuals with that qualification, and only 70 arborists who hold both credentials.[citation needed]

References

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  1. ^ "International Society of Arboriculture homepage". www.isa-arbor.com. Retrieved 2022-11-03.
  2. ^ "International Society of Arboriculture > Who We Are > Our Services". www.isa-arbor.com. Retrieved 2022-11-03.
  3. ^ "International Society of Arboriculture > Online Learning". www.isa-arbor.com. Retrieved 2022-11-03.
  4. ^ "International Society of Arboriculture > Membership > Student Programs". www.isa-arbor.com. Retrieved 2022-11-03.
  5. ^ "International Society of Arboriculture > Who We Are > Our Network". www.isa-arbor.com. Retrieved 2022-11-03.
  6. ^ "ISA Certified Arborist". International Society of Arboriculture. Retrieved 26 August 2022.
  7. ^ Konijnendijk, Cecil C.; Randrup, Thomas B. (2005). "Urban forestry education". In Konijnendijk, Cecil C.; Nilsson, Kjell; Randrup, Thomas B.; Schipperijn, Jasper (eds.). Urban Forests and Trees: A Reference Book. Berlin: Springer. p. 470. ISBN 9783540276845.
  8. ^ Koeser, Andrew K.; Hauer, Richard J.; Miesbauer, Jason W.; Peterson, Ward (2016). "Municipal tree risk assessment in the United States: Findings from a comprehensive survey of urban forest management". Arboricultural Journal. 38 (4): 218–229. doi:10.1080/03071375.2016.1221178.
  9. ^ "What is a consulting arborist?". American Society of Consulting Arborists. Archived from the original on 2010-10-17. Retrieved 2012-06-11.
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Lithia Springs may refer to:

An arborist practicing tree care: using a chainsaw to fell a eucalyptus tree in a park at Kallista, Victoria.

Arboriculture (/ˈɑːrbərɪˌkʌltʃər, ɑːrˈbɔːr-/)[1] is the cultivation, management, and study of individual trees, shrubs, vines, and other perennial woody plants. The science of arboriculture studies how these plants grow and respond to cultural practices and to their environment. The practice of arboriculture includes cultural techniques such as selection, planting, training, fertilization, pest and pathogen control, pruning, shaping, and removal.

Overview

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A person who practices or studies arboriculture can be termed an arborist or an arboriculturist. A tree surgeon is more typically someone who is trained in the physical maintenance and manipulation of trees and therefore more a part of the arboriculture process rather than an arborist. Risk management, legal issues, and aesthetic considerations have come to play prominent roles in the practice of arboriculture. Businesses often need to hire arboriculturists to complete "tree hazard surveys" and generally manage the trees on-site to fulfill occupational safety and health obligations.[citation needed]

Arboriculture is primarily focused on individual woody plants and trees maintained for permanent landscape and amenity purposes, usually in gardens, parks or other populated settings, by arborists, for the enjoyment, protection, and benefit of people.[citation needed]

Arboricultural matters are also considered to be within the practice of urban forestry yet the clear and separate divisions are not distinct or discreet.[citation needed]

Tree Benefits

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Tree benefits are the economic, ecological, social and aesthetic use, function purpose, or services of a tree (or group of trees), in its situational context in the landscape.

Environmental Benefits

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  • Erosion control and soil retention
  • Improved water infiltration and percolation
  • Protection from exposure: windbreak, shade, impact from hail/rainfall
  • Air humidification
  • Modulates environmental conditions in a given microclimate: shields wind, humidifies, provides shade
  • Carbon sequestration and oxygen production

Ecological Benefits

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  • Attracting pollinators
  • Increased biodiversity
  • Food for decomposers, consumers, and pollinators
  • Soil health: organic matter accumulation from leaf litter and root exudates (symbiotic microbes)
  • Ecological habitat

Socioeconomic Benefits

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  • Increases employment: forestry, education, tourism
  • Run-off and flood control (e.g. bioswales, plantings on slopes)
  • Aesthetic beauty: parks, gatherings, social events, tourism, senses (fragrance, visual), focal point
  • Adds character and prestige to the landscape, creating a "natural" feel
  • Climate control (e.g shade): can reduce energy consumption of buildings
  • Privacy and protection: from noise, wind
  • Cultural benefits: eg. memorials for a loved one
  • Medical benefits: eg. Taxus chemotherapy
  • Materials: wood for building, paper pulp
  • Fodder for livestock
  • Property value: trees can increase by 10–20%[citation needed]
  • Increases the amount of time customers will spend in a mall, strip mall, shopping district[citation needed]

Tree Defects

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A tree defect is any feature, condition, or deformity of a tree that indicates weak structure or instability that could contribute to tree failure.

Common types of tree defects:

Codominant stems: two or more stems that grow upward from a single point of origin and compete with one another.

  • common with decurrent growth habits
  • occurs in excurrent trees only after the leader is killed and multiple leaders compete for dominance

Included bark: bark is incorporated in the joint between two limbs, creating a weak attachment

  • occurs in branch unions with a high attachment angle (i.e. v-shaped unions)
  • common in many columnar/fastigiate growing deciduous trees

Dead, diseased, or broken branches:

  • woundwood cannot grow over stubs or dead branches to seal off decay
  • symptoms/signs of disease: e.g. oozing through the bark, sunken areas in the bark, and bark with abnormal patterns or colours, stunted new growth, discolouration of the foliage

Cracks

  • longitudinal cracks result from interior decay, bark rips/tears, or torsion from wind load
  • transverse cracks result from buckled wood, often caused by unnatural loading on branches, such as lion's tailing.
  • Seams: bark edges meet at a crack or wound
  • Ribs: bulges, indicating interior cracks

Cavity and hollows: sunken or open areas wherein a tree has suffered injury followed by decay. Further indications include: fungal fruiting structures, insect or animal nests.

Lean: a lean of more than 40% from vertical presents a risk of tree failure

Taper: change in diameter over the length of trunks branches and roots

Epicormic branches (water sprouts in canopy or suckers from root system): often grow in response to major damage or excessive pruning

Roots:

  • girdling roots compress the trunk, leading to poor trunk taper, and restrict vascular flow
  • kinked roots provide poor structural support; the kink is a site of potential root failure
  • circling roots occurs when roots encounter obstructions/limitations such as a small tree well or being grown too long in a nursery pot; these cannot provide adequate structural support and are limited in accessing nutrients and water
  • healthy soil texture and depth, drainage, water availability, makes for healthy roots

Tree Installation

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Proper tree installation ensures the long-term viability of the tree and reduces the risk of tree failure.

Quality nursery stock must be used. There must be no visible damage or sign of disease. Ideally the tree should have good crown structure. A healthy root ball should not have circling roots and new fibrous roots should be present at the soil perimeter. Girdling or circling roots should be pruned out. Excess soil above the root flare should be removed immediately, since it present a risk of disease ingress into the trunk.

Appropriate time of year to plant: generally fall or early spring in temperate regions of the northern hemisphere.

Planting hole: the planting hole should be 3 times the width of the root ball. The hole should be dug deep enough that when the root ball is placed on the substrate, the root flare is 3–5cm above the surrounding soil grade. If soil is left against the trunk, it may lead to bark, cambium and wood decay. Angular sides to the planting hole will encourage roots to grow radially from the trunk, rather than circling the planting hole. In urban settings, soil preparation may include the use of:

  • Silva cells: suspended pavement over modular cells containing soil for root development
  • Structural soils: growing medium composed of 80% crushed rock and 20% loam, which supports surface load without it leading to soil compaction

Tree wells: a zone of mulch can be installed around the tree trunk to: limit root zone competition (from turf or weeds), reduce soil compaction, improve soil structure, conserve moisture, and keep lawn equipment at a distance. No more than 5–10cm of mulch should be used to avoid suffocating the roots. Mulch must be kept approximately 20cm from the trunk to avoid burying the root flare. With city trees additional tree well preparation includes:

Tree grates/grill and frames: limit compaction on root zone and mechanical damage to roots and trunk

Root barriers: forces roots to grow down under surface asphalt/concrete/pavers to limit infrastructure damage from roots

Staking: newly planted, immature trees should be staked for one growing season to allow for the root system to establish. Staking for longer than one season should only be considered in situations where the root system has failed to establish sufficient structural support. Guy wires can be used for larger, newly planted trees. Care must be used to avoid stem girdling from the support system ties.

Irrigation: irrigation infrastructure may be installed to ensure a regular water supply throughout the lifetime of the tree. Wicking beds are an underground reservoir from which water is wicked into soil. Watering bags may be temporarily installed around tree stakes to provide water until the root system becomes established. Permeable paving allows for water infiltration in paved urban settings, such as parks and walkways.

UK

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Within the United Kingdom trees are considered as a material consideration within the town planning system and may be conserved as amenity landscape[2] features.

The role of the Arborist or Local Government Arboricultural Officer is likely to have a great effect on such matters. Identification of trees of high quality which may have extensive longevity is a key element in the preservation of trees.

Urban and rural trees may benefit from statutory protection under the Town and Country Planning[3] system. Such protection can result in the conservation and improvement of the urban forest as well as rural settlements.

Historically the profession divides into the operational and professional areas. These might be further subdivided into the private and public sectors. The profession is broadly considered as having one trade body known as the Arboricultural Association, although the Institute of Chartered Foresters offers a route for professional recognition and chartered arboriculturist status.

The qualifications associated with the industry range from vocational to Doctorate. Arboriculture is a comparatively young industry.

See also

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References

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  1. ^ "arboriculture". Dictionary.com Unabridged (Online). n.d.
  2. ^ "Amenity landscapes • Environment Guide". www.environmentguide.org.nz. Retrieved 2020-04-28.
  3. ^ "Town and Country Planning Association". Town and Country Planning Association. Retrieved 2020-04-28.
  • Harris, Richard W. (1983). Arboriculture: Care of Trees, Shrubs, and Vines in the Landscape. Englewood Cliffs, New Jersey: Prentice-Hall, Inc. pp. 2–3. ISBN 0-13-043935-5.
  • "arboriculture". Merriam-Webster's Collegiate Dictionary, Eleventh Edition. Merriam-Webster.
  • "arboriculture". Encyclopædia Britannica Online. 2007.
  • "arboriculture". The American Heritage Dictionary of the English Language, Fourth Edition Online. Houghton Mifflin Company. 2000.
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A Timberjack wheeled harvester stacking cut timber in Finland

Forestry is the science and craft of creating, managing, planting, using, conserving and repairing forests and woodlands for associated resources for human and environmental benefits.[1] Forestry is practiced in plantations and natural stands.[2] The science of forestry has elements that belong to the biological, physical, social, political and managerial sciences.[3] Forest management plays an essential role in the creation and modification of habitats and affects ecosystem services provisioning.[4]

Modern forestry generally embraces a broad range of concerns, in what is known as multiple-use management, including: the provision of timber, fuel wood, wildlife habitat, natural water quality management, recreation, landscape and community protection, employment, aesthetically appealing landscapes, biodiversity management, watershed management, erosion control, and preserving forests as "sinks" for atmospheric carbon dioxide.

Forest ecosystems have come to be seen as the most important component of the biosphere,[5] and forestry has emerged as a vital applied science, craft, and technology. A practitioner of forestry is known as a forester. Another common term is silviculturist. Silviculture is narrower than forestry, being concerned only with forest plants, but is often used synonymously with forestry.

All people depend upon forests and their biodiversity, some more than others.[6] Forestry is an important economic segment in various industrial countries,[7] as forests provide more than 86 million green jobs and support the livelihoods of many more people.[6] For example, in Germany, forests cover nearly a third of the land area,[8] wood is the most important renewable resource, and forestry supports more than a million jobs and about €181 billion of value to the German economy each year.[9]

Worldwide, an estimated 880 million people spend part of their time collecting fuelwood or producing charcoal, many of them women.[6][quantify] Human populations tend to be low in areas of low-income countries with high forest cover and high forest biodiversity, but poverty rates in these areas tend to be high.[6] Some 252 million people living in forests and savannahs have incomes of less than US$1.25 per day.[6]

Science

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Forestry as a science

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Over the past centuries, forestry was regarded as a separate science. With the rise of ecology and environmental science, there has been a reordering in the applied sciences. In line with this view, forestry is a primary land-use science comparable with agriculture.[10] Under these headings, the fundamentals behind the management of natural forests comes by way of natural ecology. Forests or tree plantations, those whose primary purpose is the extraction of forest products, are planned and managed to utilize a mix of ecological and agroecological principles.[11] In many regions of the world there is considerable conflict between forest practices and other societal priorities such as water quality, watershed preservation, sustainable fishing, conservation, and species preservation.[12]

Silvology

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Silvology (Latin: silva or sylva, "forests and woods"; Ancient Greek: -λογία, -logia, "science of" or "study of") is the biological science of studying forests and woodlands, incorporating the understanding of natural forest ecosystems, and the effects and development of silvicultural practices. The term complements silviculture, which deals with the art and practice of forest management.[13]

Silvology is seen as a single science for forestry and was first used by Professor Roelof A.A. Oldeman at Wageningen University.[14] It integrates the study of forests and forest ecology, dealing with single tree autecology and natural forest ecology.

Dendrology

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Leaf shape is a common method used to identify trees.

Dendrology (Ancient Greek: δένδρον, dendron, "tree"; and Ancient Greek: -λογία, -logia, science of or study of) or xylology (Ancient Greek: ξύλον, ksulon, "wood") is the science and study of woody plants (trees, shrubs, and lianas), specifically, their taxonomic classifications.[15] There is no sharp boundary between plant taxonomy and dendrology; woody plants not only belong to many different plant families, but these families may be made up of both woody and non-woody members. Some families include only a few woody species. Dendrology, as a discipline of industrial forestry, tends to focus on identification of economically useful woody plants and their taxonomic interrelationships. As an academic course of study, dendrology will include all woody plants, native and non-native, that occur in a region. A related discipline is the study of sylvics, which focuses on the autecology of genera and species.

In the past, dendrology included the study of the natural history of woody species in specific regions, but this aspect is now considered part of ecology. The field also plays a role in conserving rare or endangered species.[15]

Genetic diversity in forestry

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The provenance of forest reproductive material used to plant forests has a great influence on how the trees develop, hence why it is important to use forest reproductive material of good quality and of high genetic diversity.[16] More generally, all forest management practices, including in natural regeneration systems, may impact the genetic diversity of trees.

The term genetic diversity describes the differences in DNA sequence between individuals as distinct from variation caused by environmental influences. The unique genetic composition of an individual (its genotype) will determine its performance (its phenotype) at a particular site.[17]

Genetic diversity is needed to maintain the vitality of forests and to provide resilience to pests and diseases. Genetic diversity also ensures that forest trees can survive, adapt and evolve under changing environmental conditions. Furthermore, genetic diversity is the foundation of biological diversity at species and ecosystem levels. Forest genetic resources are therefore important to consider in forest management.[16]

Genetic diversity in forests is threatened by forest fires, pests and diseases, habitat fragmentation, poor silvicultural practices and inappropriate use of forest reproductive material.

About 98 million hectares of forest were affected by fire in 2015; this was mainly in the tropical domain, where fire burned about 4 percent of the total forest area in that year. More than two-thirds of the total forest area affected was in Africa and South America. Insects, diseases and severe weather events damaged about 40 million hectares of forests in 2015, mainly in the temperate and boreal domains.[18]

Furthermore, the marginal populations of many tree species are facing new threats due to the effects of climate change.[16]

Most countries in Europe have recommendations or guidelines for selecting species and provenances that can be used in a given site or zone.[17]

Forest management

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Sustainable forest management balances local socioeconomic, cultural, and ecological needs and constraints.

Forest management is a branch of forestry concerned with overall administrative, legal, economic, and social aspects, as well as scientific and technical aspects, such as silviculture, forest protection, and forest regulation. This includes management for timber, aesthetics, recreation, urban values, water, wildlife, inland and nearshore fisheries, wood products, plant genetic resources, and other forest resource values.[19] Management objectives can be for conservation, utilisation, or a mixture of the two. Techniques include timber extraction, planting and replanting of different species, building and maintenance of roads and pathways through forests, and preventing fire.

Many tools like remote sensing, GIS and photogrammetry[20][21] modelling have been developed to improve forest inventory and management planning.[22] Scientific research plays a crucial role in helping forest management. For example, climate modeling,[23][24][25] biodiversity research,[26][27] carbon sequestration research,[24][28][29] GIS applications,[30][31] and long-term monitoring[25][32] help assess and improve forest management, ensuring its effectiveness and success.

Urban forestry

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Tree pruning in Durham, North Carolina
Professional Tree Climber (arborist: Zack Weiler) climbing a willow tree in Port Elgin, ON. Canada
James Kinder, an ISA Certified Municipal Arborist examining a Japanese Hemlock at Hoyt Arboretum
Urban forestry is the care and management of single trees and tree populations in urban settings for the purpose of improving the urban environment. Urban forestry involves both planning and management, including the programming of care and maintenance operations of the urban forest.[33] Urban forestry advocates the role of trees as a critical part of the urban infrastructure. Urban foresters plant and maintain trees, support appropriate tree and forest preservation, conduct research and promote the many benefits trees provide. Urban forestry is practiced by municipal and commercial arborists, municipal and utility foresters, environmental policymakers, city planners, consultants, educators, researchers and community activists.

Forestry education

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History of forestry education

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The first dedicated forestry school was established by Georg Ludwig Hartig at Hungen in the Wetterau, Hesse, in 1787, though forestry had been taught earlier in central Europe, including at the University of Giessen, in Hesse-Darmstadt.

In Spain, the first forestry school was the Forest Engineering School of Madrid (Escuela Técnica Superior de Ingenieros de Montes), founded in 1844.

The first in North America, the Biltmore Forest School was established near Asheville, North Carolina, by Carl A. Schenck on September 1, 1898, on the grounds of George W. Vanderbilt's Biltmore Estate. Another early school was the New York State College of Forestry, established at Cornell University just a few weeks later, in September 1898.

Early 19th century North American foresters went to Germany to study forestry. Some early German foresters also emigrated to North America.

In South America the first forestry school was established in Brazil, in Viçosa, Minas Gerais, in 1962, and moved the next year to become a faculty at the Federal University of Paraná, in Curitiba.[34]

Forestry education today

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Prescribed burning is used by foresters to reduce fuel loads.

Today, forestry education typically includes training in general biology, ecology, botany, genetics, soil science, climatology, hydrology, economics and forest management. Education in the basics of sociology and political science is often considered an advantage. Professional skills in conflict resolution and communication are also important in training programs.[35]

In India, forestry education is imparted in the agricultural universities and in Forest Research Institutes (deemed universities). Four year degree programmes are conducted in these universities at the undergraduate level. Masters and Doctorate degrees are also available in these universities.

In the United States, postsecondary forestry education leading to a Bachelor's degree or Master's degree is accredited by the Society of American Foresters.[36]

In Canada the Canadian Institute of Forestry awards silver rings to graduates from accredited university BSc programs, as well as college and technical programs.[37]

In many European countries, training in forestry is made in accordance with requirements of the Bologna Process and the European Higher Education Area.

The International Union of Forest Research Organizations is the only international organization that coordinates forest science efforts worldwide.[38]

Continuing education

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In order to keep up with changing demands and environmental factors, forestry education does not stop at graduation. Increasingly, forestry professionals engage in regular training to maintain and improve on their management practices. An increasingly popular tool are marteloscopes; one hectare large, rectangular forest sites where all trees are numbered, mapped and recorded.

These sites can be used to do virtual thinnings and test one's wood quality and volume estimations as well as tree microhabitats. This system is mainly suitable to regions with small-scale multi-functional forest management systems

History

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Society and culture

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Literature

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The first book edition of Sylva

Forestry literature is the books, journals and other publications about forestry.

The first major works about forestry in the English language included Roger Taverner's Booke of Survey (1565), John Manwood's A Brefe Collection of the Lawes of the Forrest (1592) and John Evelyn's Sylva (1662).[39]

Noted silvologists

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See also

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References

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  1. ^ "SAFnet Dictionary | Definition For [forestry]". Dictionaryofforestry.org. 2008-10-22. Archived from the original on 2013-10-19. Retrieved 2014-03-15.
  2. ^ "Seed Origin -pinga Forestry Focus". Forestry Focus. Retrieved April 5, 2018.
  3. ^ Young, Raymond A. (1982). Introduction to Forest Science. John Wiley & Sons. p. ix. ISBN 978-0-471-06438-1.
  4. ^ Frouz, Jan; Frouzová, Jaroslava (2022). Applied Ecology. doi:10.1007/978-3-030-83225-4. ISBN 978-3-030-83224-7. S2CID 245009867.
  5. ^ "ecosystem part of biosphere". Tutorvista.com. Archived from the original on 2013-11-11. Retrieved 2014-03-15.
  6. ^ a b c d e The State of the World's Forests 2020. Forests, biodiversity and people – In brief. Rome: FAO & UNEP. 2020. doi:10.4060/ca8985en. ISBN 978-92-5-132707-4. S2CID 241416114.
  7. ^ "How does the forest industry contribute to the economy?". www.nrcan.gc.ca. 26 August 2014. Retrieved April 5, 2018.
  8. ^ Bundeswaldinventur 2002 Archived 2014-10-06 at the Wayback Machine, Bundesministerium für Ernährung, Landwirtschaft und Verbraucherschutz (BMELV), retrieved, 17 January 2010
  9. ^ Unternehmen Wald, forests as an enterprise, German private forestry association website Archived 2016-09-18 at the Wayback Machine
  10. ^ Wojtkowski, Paul A. (2002) Agroecological Perspectives in Agronomy, Forestry and Agroforestry. Science Publishers Inc., Enfield, NH, 356p.
  11. ^ Wojtkowski, Paul A. (2006) Undoing the Damage: Silviculture for Ecologists and Environmental Scientists. Science Publishers Inc., Enfield, NH, 313p.
  12. ^ Fishes and forestry : worldwide watershed interactions and management. Northcote, T. G., Hartman, G. F. Oxford, UK: Blackwell Science. 2004. ISBN 978-0-470-99524-2. OCLC 184983506.cite book: CS1 maint: others (link)
  13. ^ Hemery, G.; Skovsgaard, J. P. (April 2018). "Silvology: Redefining the Biological Science for the Study of Forests". Quarterly Journal of Forestry. 112 (2): 128–31.
  14. ^ Oldeman, R. A. A. (1990). Forests: elements of silvology. Berlin: Springer-Verlag. p. 624. ISBN 0-387-51883-5.
  15. ^ a b "Dendrology | Definition & Description | Britannica". www.britannica.com. Retrieved 2024-04-08.
  16. ^ a b c de Vries, S.M.G., Alan, M., Bozzano, M., Burianek, V., Collin, E., Cottrell, J., Ivankovic, M., Kelleher, C.T., Koskela, J., Rotach, P., Vietto, L. and Yrjänä, L. (2015). "Pan-European strategy for genetic conservation of forest trees and establishment of a core network of dynamic conservation units" (PDF). European Forest Genetic Resources Programme, Bioversity International, Rome, Italy.: xii + 40 p. Archived from the original (PDF) on 2017-01-31. Retrieved 2017-01-20.cite journal: CS1 maint: multiple names: authors list (link)
  17. ^ a b Konnert, M., Fady, B., Gömöry, D., A’Hara, S., Wolter, F., Ducci, F., Koskela, J., Bozzano, M., Maaten, T. and Kowalczyk, J. (2015). "Use and transfer of forest reproductive material in Europe in the context of climate change" (PDF). European Forest Genetic Resources Programme, Bioversity International, Rome, Italy.: xvi and 75 p. Archived from the original (PDF) on 2017-08-04. Retrieved 2017-01-20.cite journal: CS1 maint: multiple names: authors list (link)
  18. ^ Global Forest Resources Assessment 2020 – Key findings. Rome: FAO. 2020. doi:10.4060/ca8753en. ISBN 978-92-5-132581-0. S2CID 130116768.
  19. ^ "Glossary of Forestry Terms in British Columbia" (PDF). Ministry of Forests and Range (Canada). March 2008. Retrieved 2009-04-06.
  20. ^ "I. Balenovich, A. Seletkovich, et al. Comparison of Classical Terrestrial and Photogrammetric Method in Creating Management Division. FORMEC. Croatia 2012. pp. 1-13".
  21. ^ "I. Balenović, D. Vuletić, et al. Digital Photogrammetry – State of the Art and Potential for Application in Forest Management in Croatia. SEEFOR. South-East European Forestry. #2, 2011. pp. 81–93" (PDF).
  22. ^ Mozgeris, Gintautas (May 30, 2009). "The continuous field view of representing forest geographically: from cartographic representation towards improved management planning". S.A.P.I.EN.S. 2 (2) – via journals.openedition.org.
  23. ^ Anderegg, William R. L.; Wu, Chao; Acil, Nezha; Carvalhais, Nuno; Pugh, Thomas A. M.; Sadler, Jon P.; Seidl, Rupert (2 September 2022). "A climate risk analysis of Earth's forests in the 21st century" (PDF). Science. 377 (6610): 1099–1103. Bibcode:2022Sci...377.1099A. doi:10.1126/science.abp9723. PMID 36048937. S2CID 252010508.
  24. ^ a b Windisch, Michael G.; Davin, Edouard L.; Seneviratne, Sonia I. (October 2021). "Prioritizing forestation based on biogeochemical and local biogeophysical impacts". Nature Climate Change. 11 (10): 867–871. Bibcode:2021NatCC..11..867W. doi:10.1038/s41558-021-01161-z. S2CID 237947801. ProQuest 2578272675.
  25. ^ a b Benedek, Zsófia; FertÅ‘, Imre (2013). "Development and application of a new Forestation Index: global forestation patterns and drivers" (Document). IEHAS Discussion Papers. hdl:10419/108304. ProQuest 1698449297.
  26. ^ Zhang, Mingfang; Wei, Xiaohua (5 March 2021). "Deforestation, forestation, and water supply". Science. 371 (6533): 990–991. Bibcode:2021Sci...371..990Z. doi:10.1126/science.abe7821. PMID 33674479. S2CID 232124649.
  27. ^ Prevedello, Jayme A.; Winck, Gisele R.; Weber, Marcelo M.; Nichols, Elizabeth; Sinervo, Barry (20 March 2019). "Impacts of forestation and deforestation on local temperature across the globe". PLOS ONE. 14 (3): e0213368. Bibcode:2019PLoSO..1413368P. doi:10.1371/journal.pone.0213368. PMC 6426338. PMID 30893352. Gale A579457448.
  28. ^ Anderegg, William R. L.; Wu, Chao; Acil, Nezha; Carvalhais, Nuno; Pugh, Thomas A. M.; Sadler, Jon P.; Seidl, Rupert (2 September 2022). "A climate risk analysis of Earth's forests in the 21st century" (PDF). Science. 377 (6610): 1099–1103. Bibcode:2022Sci...377.1099A. doi:10.1126/science.abp9723. PMID 36048937. S2CID 252010508.
  29. ^ Portmann, Raphael; Beyerle, Urs; Davin, Edouard; Fischer, Erich M.; De Hertog, Steven; Schemm, Sebastian (4 October 2022). "Global forestation and deforestation affect remote climate via adjusted atmosphere and ocean circulation". Nature Communications. 13 (1): 5569. Bibcode:2022NatCo..13.5569P. doi:10.1038/s41467-022-33279-9. PMC 9532392. PMID 36195588.
  30. ^ Zhang, Mingfang; Wei, Xiaohua (5 March 2021). "Deforestation, forestation, and water supply". Science. 371 (6533): 990–991. Bibcode:2021Sci...371..990Z. doi:10.1126/science.abe7821. PMID 33674479. S2CID 232124649.
  31. ^ AbdulBaqi, Faten Khalid (June 2022). "The effect of afforestation and green roofs techniques on thermal reduction in Duhok city". Trees, Forests and People. 8: 100267. Bibcode:2022TFP.....800267A. doi:10.1016/j.tfp.2022.100267. S2CID 248646593.
  32. ^ Prevedello, Jayme A.; Winck, Gisele R.; Weber, Marcelo M.; Nichols, Elizabeth; Sinervo, Barry (20 March 2019). "Impacts of forestation and deforestation on local temperature across the globe". PLOS ONE. 14 (3): e0213368. Bibcode:2019PLoSO..1413368P. doi:10.1371/journal.pone.0213368. PMC 6426338. PMID 30893352. Gale A579457448.
  33. ^ Caves, R. W. (2004). Encyclopedia of the City. Routledge. p. 695. ISBN 978-0415862875.
  34. ^ "News of the world". Unasylva. 23 (3). FAO. 1969. Archived from the original on 2010-04-27. Retrieved 2010-10-12.
  35. ^ Sample, V. A.; Bixler, R. P.; McDonough, M. H.; Bullard, S. H.; Snieckus, M. M. (July 16, 2015). "The Promise and Performance of Forestry Education in the United States: Results of a Survey of Forestry Employers, Graduates, and Educators". Journal of Forestry. 113 (6): 528–537. doi:10.5849/jof.14-122.
  36. ^ "SAF Accredited and Candidate Forestry Degree Programs" (PDF) (Press release). Society of American Foresters. 2008-05-19. Archived from the original (PDF) on 2009-02-26. The Society of American Foresters grants accreditation only to specific educational curricula that lead to a first professional degree in forestry at the bachelor's or master's level.
  37. ^ "Canadian Institute of Forestry - Silver Ring Program". Cif-ifc.org. Archived from the original on 2014-02-01. Retrieved 2014-03-15.
  38. ^ "Discover IUFRO:The Organization". IUFRO. Archived from the original on 2010-07-08. Retrieved 2010-10-12.
  39. ^ N.D.G. James (1996), "A History of Forestry and Monographic Forestry Literature in Germany, France, and the United Kingdom", The Literature of Forestry and Agroforestry, Cornell University Press, pp. 34–35, ISBN 9780801431814

Sources

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 This article incorporates text from a free content work. Licensed under CC BY-SA 3.0 (license statement/permission). Text taken from Global Forest Resources Assessment 2020 Key findings​, FAO, FAO.

 This article incorporates text from a free content work. Licensed under CC BY-SA 3.0 IGO (license statement/permission). Text taken from The State of the World's Forests 2020. Forests, biodiversity and people – In brief​, FAO & UNEP, FAO & UNEP.

 This article incorporates text from a free content work. Licensed under CC BY-SA IGO 3.0 (license statement/permission). Text taken from World Food and Agriculture – Statistical Yearbook 2023​, FAO, FAO.

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